30″ x 60″ ShowerTub Shower Base – Left Drain White. Replace a standard 5 bathtub with an easy-access shower?or install one in new construction where a standard bathtub was planned. The unique ShowerTub from E.L. Mustee & Sons will let you achieve either?with no need for major re-plumbing or changing the room layout. ShowerTub? provides approximately 35% more usable interior floor space than a standard tub and eliminates the difficulties of stepping up and over a standard 15? high tub apron. It?s excellent for seniors living independently or a beautiful way to create a luxury walk-in shower.